Luminous sign



FIG. 1 is a front view of the luminous sign showing the new design the rear view of which is identical;

FIG. 2 is a front view thereof in an open position the rear view of which is identical;

FIG. 3 is a left side view thereof, the right side view being identical;

FIG. 4 is a left side view thereof in an open position the right view of which is identical;

FIG. 5 is a bottom view thereof in a closed position; and,

FIG. 6 is a top view thereof in a closed position. 

The ornamental design for a luminous sign, as shown and described. 